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selftest/futex: Reintroduce "Memory out of range" numa_mpol's subtest

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Commit d8e2f91999 ("selftests/futex: Fix some futex_numa_mpol
subtests") removed the "Memory out of range" subtest due to it being
dependent on the memory layout of the test process having an invalid
memory address just after the `*futex_ptr` allocated memory.

Reintroduce this test and make it deterministic, by allocation two
memory pages and marking the second one with PROT_NONE.

Signed-off-by: André Almeida <andrealmeid@igalia.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Waiman Long <longman@redhat.com>
This commit is contained in:
André Almeida 2025-09-15 23:26:29 +02:00 committed by Peter Zijlstra
parent c1c8634577
commit 2951dddef0
1 changed files with 7 additions and 1 deletions
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8
tools/testing/selftests/futex/functional/futex_numa_mpol.c
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@ -174,10 +174,13 @@ int main(int argc, char *argv[])
ksft_set_plan(1);
mem_size = sysconf(_SC_PAGE_SIZE);
futex_ptr = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
futex_ptr = mmap(NULL, mem_size * 2, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
if (futex_ptr == MAP_FAILED)
ksft_exit_fail_msg("mmap() for %d bytes failed\n", mem_size);
/* Create an invalid memory region for the "Memory out of range" test */
mprotect(futex_ptr + mem_size, mem_size, PROT_NONE);
futex_numa = futex_ptr;
ksft_print_msg("Regular test\n");
@ -192,6 +195,9 @@ int main(int argc, char *argv[])
ksft_print_msg("Mis-aligned futex\n");
test_futex(futex_ptr + mem_size - 4, EINVAL);
ksft_print_msg("Memory out of range\n");
test_futex(futex_ptr + mem_size, EFAULT);
futex_numa->numa = FUTEX_NO_NODE;
mprotect(futex_ptr, mem_size, PROT_READ);
ksft_print_msg("Memory, RO\n");